| There are many shortcomings in the traditional fault detection and locating algorithm for railway transmission/automatically blocked power line. It seriously restricts the railway transportation to developing for high speed and high density. Making use of the HUST's patent of invention, the fault detection and location algorithm for railway transmission/automatically blocked power line is improved in the DKHK-type railway automatic distribution system.Firstly, the paper introduces the DKHK-type system simply, and it introduces the communication scheme in detail according to the distributed structure and the railway special communication network.According to the comparison of several remote communication schemes, two-layered bus communication mode is adopted, in which the advantages of the field bus communication is introduced. According to every layer's special condition and command, different communication scheme and medium are selected. This communication system has two-stage communications to connect the three-layer equipments. In every area, there are one set of industrial computer which forms the top layer, four sets of PC104 which form the middle layer, and about 10 sets of lower computer which belong to every PC104. CAN-bus protocol is adapted between the industrial computer and PC104, RS485 bus is adapted between the PC104 and lower computers.The realization of the communication system is discussed emphatically. which includes the protocols for the two-stage communications and the software of the three-layer equipments. In addition, different physics links in different interface for the railway special communication connect-networks is described separatedly.Because all of the communication devices work independently, some devices which have malfunction will not affect others and the speed will not reduce. Although there are lots of FTU in all around, this communication system realizes the remote transmission with information integrity, nicety, speediness and priority. |
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